// 实现这个项目的构建任务

const {src, dest, parallel, series, watch} = require('gulp')

const loadPlugins = require('gulp-load-plugins')
const plugins = loadPlugins()

const browserSync = require('browser-sync')
const bs = browserSync.create()

const del = require('del')





const data = {
    menus: [
      {
        name: 'Home',
        icon: 'aperture',
        link: 'index.html'
      },
      {
        name: 'Features',
        link: 'features.html'
      },
      {
        name: 'About',
        link: 'about.html'
      },
      {
        name: 'Contact',
        link: '#',
        children: [
          {
            name: 'Twitter',
            link: 'https://twitter.com/w_zce'
          },
          {
            name: 'About',
            link: 'https://weibo.com/zceme'
          },
          {
            name: 'divider'
          },
          {
            name: 'About',
            link: 'https://github.com/zce'
          }
        ]
      }
    ],
    pkg: require('./package.json'),
    date: new Date()
  }



//开始了
//style
const style = () => {
    return src('src/assets/styles/*.scss',{base: 'src'}) //base可以保证路径
    .pipe(plugins.sass({outputSyle:'expanded'})) //css是打开的
    .pipe(dest('temp'))
    .pipe(bs.reload({stream:true}))
}

//script
const script = () =>{
    return src('src/assets/scripts/*.js',{base: 'src'})
    .pipe(plugins.babel({presets: ['@babel/preset-env']}))
    .pipe(dest('temp'))
    .pipe(bs.reload({stream:true}))
}

const page = () =>{
    return src('src/*.html', {base: 'src'})
    .pipe(plugins.swig({data:data, defaults: { cache: false }})) //defaults，防止页面更新不及时
    .pipe(dest('temp'))
    .pipe(bs.reload({stream:true}))
}

const image = () => {
    return src('src/assets/images/**', {base: 'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const font = () => {
    return src('src/assets/fonts/**', {base: 'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const extra = () => {
    return src('public/**', {base: 'public'})
    .pipe(dest('dist'))
}

const serve = () => {
    watch('src/assets/styles/*.scss', style)
    watch('src/assets/scripts/*.js', script)
    watch('src/*.html', page)
    watch([
        'src/assets/images/**',
        'src/assets/fonts/**',
        'public/**'
    ],bs.reload)
    bs.init({
        notify: false,
        port: 2080,
        server: {
            baseDir: ['temp', 'src', 'public'],
            routes: {
                '/node_modules': 'node_modules'
            }
        }

    })

}

const useref = () => {
    return src('temp/*.html', {base: 'temp'})
    .pipe(plugins.useref({ searchPath: ['temp', '.']}))
    .pipe(plugins.if(/\.js$/,plugins.uglify()))
    .pipe(plugins.if(/\.css$/,plugins.cleanCss()))
    .pipe(plugins.if(/\.html$/,plugins.htmlmin({
        collapseWhitespace: true,
        minifyCSS: true,
        minifyJS: true
    })))
    .pipe(dest('dist'))

}

const clean = () => {
    return del(['temp', 'dist'])
}
const compile = parallel(style, script, page)
const develop = series(compile, serve)
const bulid = series(
    clean,
    parallel(
        series(compile,useref),
        image,
        font,
        extra
    )
)





module.exports = {
    style,
    script,
    page,
    image,
    font,
    extra,
    develop,
    bulid
}